【摘要】 为了分析讨论高强混凝土梁在疲劳荷载作用下裂缝变化的一般规律和特点,通过9根配有新Ⅲ级钢筋的高强混凝土梁的等幅疲劳荷载试验,研究了影响高强混凝土梁疲劳裂缝宽度的主要因素,并根据初始裂缝宽度和受压区混凝土应变增长系数建立了疲劳荷载作用下高强混凝土梁的裂缝宽度计算公式。最后,将计算结果与试验结果进行了对比分析,分析表明:该计算公式可以准确地预测高强混凝土梁从初期裂缝开展直至破坏的裂缝宽度发展规律,可为高强混凝土梁的设计提供一定的参考。更多还原

【Abstract】 Based on the experimental results of nine high-strength concrete(HSC) beams reinforced by high-strength bars under fatigue loading with constant amplitudes,the cyclic characteristic and commonly expending rule of crack width were discussed and analyzed.The main factors which influence the crack width of HSC beams were studied,and the calculation formulas for crack width were obtained based on preliminary crack width and increasing coefficient of concrete compressive strain.The results show that the analytical model is able to predict the crack width satisfactorily when comparing with the measured crack width for each of the beams,from the cracking stage to the stage just prior to failure.The results can be used as reference for HSC beams design.更多还原